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sublogic
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Joined: 21 Mar 2022
Posts: 294
Location: Pennsylvania, USA
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 Posted: Mon Jan 06, 2025 3:22 am Post subject: [SOLVED] gentoo-sources-6.6.67 amdgpu, backlight issue |
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(Marking as solved because 6.13.rc5 from kernel.org doesn't have the issue. More of a "heads-up" in case someone else sees the same thing.)
On gentoo-sources-6.6.67, after resuming from suspend or hibernate, the backlight stays stuck at high brightness. The files in /sys/class/backlight/amdgpu_bl0 don't work, they show the requested brightness and writing to them doesn't change anything.
Hardware: HP EliteBook 745 G6; from lspci: | Code: | | VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Picasso/Raven 2 [Radeon Vega Series / Radeon Vega Mobile Series] (rev d1) |
It bisects to this: | Code: | commit 2daba7d857e48035d71cdd95964350b6d0d51545
Author: Alex Deucher <alexander.deucher@amd.com>
Date: Mon Nov 25 13:59:09 2024 -0500
drm/amdgpu: rework resume handling for display (v2)
commit 73dae652dcac776296890da215ee7dec357a1032 upstream.
Split resume into a 3rd step to handle displays when DCC is
enabled on DCN 4.0.1. Move display after the buffer funcs
have been re-enabled so that the GPU will do the move and
properly set the DCC metadata for DCN.
v2: fix fence irq resume ordering
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org # 6.11.x
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 45 ++++++++++++++++++++++++++++--
1 file changed, 43 insertions(+), 2 deletions(-) |
Yep, it sure seems related.
I'll probably bug the kernel.org people even though it is fixed in 6.13-rc5, because gentoo-sources-6.12.8 still has it and that is (based on) the latest stable kernel. I'll try 6.6.69 first. Stay tuned.
EDIT: 6.6.69 is bad.
Filed https://gitlab.freedesktop.org/drm/amd/-/issues/3879 .
Last edited by sublogic on Tue Jan 07, 2025 1:28 am; edited 1 time in total |
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sublogic
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Joined: 21 Mar 2022
Posts: 294
Location: Pennsylvania, USA
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| Posted: Tue Jan 07, 2025 1:27 am Post subject: |
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It turned out to be a mistake in a backport from Linus Torvalds' tree to the stable series, which explains why 6.13-rc5 was unaffected. Already fixed. My report upstream was a duplicate (but that wasn't obvious, the descriptions and symptoms are different).
I filed a gentoo bug because the fix is in line for the 6.12.x series but I don't see it queued for 6.6.x . Devs can do what they want. Meanwhile, my /etc/portage/patches/ takes care of it. Now running 6.6.67 with no issues. |
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